A contagious disease is a subset category of transmissible diseases, which are transmitted to other persons, either by physical contact with the person suffering the disease, or by casual contact with their secretions or objects touched by them or airborne route among other routes.

"Infectious" and "contagious" mean the same thing.

1. True
2. False

A disease is infectious if it’s caused by a bacteria, virus, or other bug that gets inside you. It’s only contagious if people can pass it to each other. Not all infectious illnesses are contagious. For instance, malaria is spread by mosquitoes. But it can't jump from person to person. So it’s infectious, but not contagious.

You could get a cold if:

1. Your dog sneezes on you.
2. You clean the kitchen for a sick friend.

People don’t normally catch colds from an animal, even your beloved dog or cat. Be careful when cleaning up after a sick friend, since viruses can live on counter tops for a while.

Vaccines fight contagious diseases by causing your body to develop:

1. Antibodies
2. Antihistamines
3. Antibotics

When you are vaccinated, the shot mimics the disease and your body creates a natural defense to it. This gives you immunity. If you are exposed to the disease later in life, your body remembers and protects you.

Once a contagious disease has disappeared from a country, we no longer need the vaccine.

1. True
2. False

Polio is a good example. The last time there was a natural outbreak that started in the U.S. was in 1979. But some countries still have it. So if a traveler brought it home and people stopped getting polio shots, it could spread.

Is pink eye contagious?

1. Yes
2. No

Viral and bacterial pink eye infections are contagious and spread very easily. Since most pink eye is caused by viruses for which there is usually no medical treatment, preventing its spread is important. Poor hand-washing is the main cause of the spread of pink eye.

Psoriasis: Contagious or not?

1. Contagious
2. Not contagious

Psoriasis is a common skin disorder that produces thick red plaques covered with silvery scales. Psoriasis is not contagious and cannot be passed from person to person, but it can occur in members of the same family.

Are canker sores contagious?

1. Yes
2. No

Canker sores are not thought to be contagious. They don't pose any health risk other than the discomfort that comes along with them.

The flu is highly contagious.

1. True
2. False

Influenza, commonly shortened to "flu," is an extremely contagious respiratory illness caused by influenza A or B viruses.

Which of the following is NOT contagious?

1. Tetanus
2. The common cold
3. Hepatitis B

You can find it in almost everywhere, including soil and dust. But you get the infection from things, not people. Hepatitis B and colds pass from person to person.

You should avoid anyone who has a contagious disease.

1. True
2. False

It depends how easily the illness spreads. Some illnesses can easily pass from person to person if they use the same things, like remote controls or phones. But you won't catch other diseases, like HIV, unless you come into contact with their blood or other bodily fluids.

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